Ttgjyuk

yes, apt-get can do that, and can do it in a nice way.

1. 
   

   Append following to ~/.bash_funcs

   
   
   

   update-repo() 
    for source in "$@"; do
    sudo apt-get update -o Dir::Etc::sourcelist="sources.list.d/$source" 
    -o Dir::Etc::sourceparts="-" -o APT::Get::List-Cleanup="0" 
    done
   
   

   
   


2. 
   

   Append following to ~/.bashrc

   
   
   

   if [ -f $HOME/.bash_funcs ]; then
   . $HOME/.bash_funcs
   fi
   

   
   


3. 
   

   Append following to ~/.bash_completion

   
   
   

   # Debian user-defined completion -*- shell-script -*-
   
   _ppa_lists() &&
   complete -F _ppa_lists update-repo
   

   
   


4. 
   

   Then source the files

   
   
   

   . ~/.bashrc
   . ~/.bash_completion
   

   
   


5. 
   

   Done and start to fire it

   
   
   

   update-repo <tab> <tab>
   

   
   

You can update a single ppa repository without having to update whole apt source, with implement of bash-completion.

If the repository is configured in a specific file in the directory /etc/apt/sources.list.d/, say myrepo.list, you can update that single repository with the command:

sudo apt-get update -o Dir::Etc::sourcelist="sources.list.d/myrepo.list" 
 -o Dir::Etc::sourceparts="-" -o APT::Get::List-Cleanup="0"

Nevertheless this is not very convenient.

This can be simplified defining a bash function

update_repo() 
 sudo apt-get update -o Dir::Etc::sourcelist="sources.list.d/$1.list" 
 -o Dir::Etc::sourceparts="-" -o APT::Get::List-Cleanup="0"

so that you can simply run

update_repo myrepo

Y PPA Manager comes with a command line tool called update-ppa that lets you update a single PPA.

For example:

sudo update-ppa ppa:nilarimogard/webupd8

Also, when adding a PPA through Y PPA Manager, the PPA source is automatically updated (only for that PPA). In a future version, there's going to be a GUI to manually update single PPAs as well.

More information about Y PPA Manager, HERE.

To update a specific repository, use -o, e.g.:

apt-get update -o Dir::Etc::sourcelist=/path/to/repo.list

Here is a one-liner updating only recently added apt repository

find /etc/apt/sources.list.d -type f -name '*.list' -exec sudo apt-get update -o Dir::Etc::sourcelist="" ';'

It's much quicker than updating all repositories, especially during VM provisioning after adding new.

The -u option was added in 15.10. From 15.10 to 17.10, you could use -u to automatically update only the specific repo you are adding:

add-apt-repository -u my-ppa

The silly thing is that this option was not added to man until 18.04 (it was documented in add-apt-repository --help, however). But in 18.04, this functionality was removed! (Again, not in man, but you can see in add-apt-repository --help).

In 18.04, the update functionality was changed to always do a full apt-get update after add-apt-repository. The -u option was effectively removed. It remains there for legacy syntax, but it is always set to options.update = False. In 18.04, you do have the option of -n, --no-update, which is like the old behavior. But it's all or nothing, you cannot update a single repo since 18.04.